package com.nothing5lose.iwillbeback.utils;

import android.util.Log;
import com.google.android.gms.maps.model.LatLng;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

public class GMapV2Direction {
	public final static String MODE_DRIVING = "driving";
	public final static String MODE_WALKING = "walking";
	
	public GMapV2Direction() { }
	
	public Document getDocument(LatLng start, LatLng end, String mode) {
		String url = "http://maps.googleapis.com/maps/api/directions/xml?" 
        		+ "origin=" + start.latitude + "," + start.longitude  
        		+ "&destination=" + end.latitude + "," + end.longitude 
        		+ "&sensor=false&units=metric&mode=driving";
        Log.e("LTT","url = "+url);
		
        try {
            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            HttpPost httpPost = new HttpPost(url);
            HttpResponse response = httpClient.execute(httpPost, localContext);
            InputStream in = response.getEntity().getContent();
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = builder.parse(in);
            return doc;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e){
            e.printStackTrace();
        } catch (SAXException e){
            e.printStackTrace();
        }
		return null;
	}
	
	public String getDurationText (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("duration");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
        Log.i("DurationText", node2.getTextContent());
		return node2.getTextContent();
	}
	
	public int getDurationValue (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("duration");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
        Log.i("DurationValue", node2.getTextContent());
		return Integer.parseInt(node2.getTextContent());
	}
	
	public String getDistanceText (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("distance");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
        Log.i("DistanceText", node2.getTextContent());
		return node2.getTextContent();
	}
	
	public int getDistanceValue (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("distance");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
        Log.i("DistanceValue", node2.getTextContent());
		return Integer.parseInt(node2.getTextContent());
	}
	
	public String getStartAddress (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("start_address");
        Node node1 = nl1.item(0);
        Log.i("StartAddress", node1.getTextContent());
		return node1.getTextContent();
	}
	
	public String getEndAddress (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("end_address");
        Node node1 = nl1.item(0);
        Log.i("StartAddress", node1.getTextContent());
		return node1.getTextContent();
	}
	
	public String getCopyRights (Document doc) {
		NodeList nl1 = doc.getElementsByTagName("copyrights");
        Node node1 = nl1.item(0);
        Log.i("CopyRights", node1.getTextContent());
		return node1.getTextContent();
	}
	
	public ArrayList<LatLng> getDirection (Document doc) {
		NodeList nl1, nl2, nl3;
        ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
        nl1 = doc.getElementsByTagName("step");
        if (nl1.getLength() > 0) {
            for (int i = 0; i < nl1.getLength(); i++) {
                Node node1 = nl1.item(i);
                nl2 = node1.getChildNodes();

                Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
                nl3 = locationNode.getChildNodes();
                Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
                double lat = Double.parseDouble(latNode.getTextContent());
                Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
                double lng = Double.parseDouble(lngNode.getTextContent());
                listGeopoints.add(new LatLng(lat, lng));

                locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
                nl3 = locationNode.getChildNodes();
                latNode = nl3.item(getNodeIndex(nl3, "points"));
                ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
                for(int j = 0 ; j < arr.size() ; j++) {
                	listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
                }

                locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
                nl3 = locationNode.getChildNodes();
                latNode = nl3.item(getNodeIndex(nl3, "lat"));
                lat = Double.parseDouble(latNode.getTextContent());
                lngNode = nl3.item(getNodeIndex(nl3, "lng"));
                lng = Double.parseDouble(lngNode.getTextContent());
                listGeopoints.add(new LatLng(lat, lng));
            }
        }
        
        return listGeopoints;
	}
	
	private int getNodeIndex(NodeList nl, String nodename) {
		for(int i = 0 ; i < nl.getLength() ; i++) {
			if(nl.item(i).getNodeName().equals(nodename))
				return i;
		}
		return -1;
	}
	
	private ArrayList<LatLng> decodePoly(String encoded) {
		ArrayList<LatLng> poly = new ArrayList<LatLng>();
		int index = 0, len = encoded.length();
		int lat = 0, lng = 0;
		while (index < len) {
			int b, shift = 0, result = 0;
			do {
				b = encoded.charAt(index++) - 63;
				result |= (b & 0x1f) << shift;
				shift += 5;
			} while (b >= 0x20);
			int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
			lat += dlat;
			shift = 0;
			result = 0;
			do {
				b = encoded.charAt(index++) - 63;
				result |= (b & 0x1f) << shift;
				shift += 5;
			} while (b >= 0x20);
			int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
			lng += dlng;
			
			LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
			poly.add(position);
		}
		return poly;
	}
}
